How to work it.

To place the Machine ready for work the indicators must be turned until zero or naught is visible; and the cylinders must be turned so that the zero or naught on the extreme left i.e., nearest to the indicators is visible.

The Machine being placed as directed, we will proceed to exemplify its mode of working—using the units cylinder.

First Example.

Turn the cylinder towards you till 4 appears in the first column at the left end—stop, start again from the Zero or Red Square, now visible till you come to 5 in that column; start again from the Zero or Red Square, now visible, till yon come to 7 in that column; start again from the Zero or Red Square, now visible, till you come to 3 in that column; start again from, the Zero or Red Square, now visible, till you come to 4 in that column.

On looking at the Indicator you will find figure 2 recorded, and figure 3 will be the figure now visible at the left end of the cylinder, the two together making 28 which is the required total.

N.B.—The result of any addition will always be found by reading the figures recorded on the indicators together with the first figure on the left end of the cylinders.

Another Example.

Still working only on the units cylinder.

Indicator marks 2; first figure on left end of cylinder 7.

Set down 7, turn the Indicator to Zero, and start with 2 at the left end of the cylinder. page 3

• Turn to you, starting from the Zero now visible, till 5 appears in that column.
• Turn to you, starting from the Zero now visible, till 5 appears in that column.
• Turn to you, starting from the Zero now visible, till 1 appears in that column.
• Turn to you, starting from the Zero now visible, till 9 appears in that column.
• Turn to you, starting from the Zero now visible, till 6 appears in that column.

The Indicator marks 2; first figure on left end of cylinder 8.

Indicator marks 1; first figure on left end of cylinder 4.

Set down 4, turn Indicator to Zero, and start with one at the left end of the cylinder,

• Turn to you, starting from the Zero now visible, till 2 appears in that column.
• Turn to you, starting from the Zero now visible, till 1 appears in that column.

The figure at the left end of the cylinder is 4.

The total obtained is 4,487.